5.3.2 switch语句

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书中页数：P160
代码名称：vowels.cc othercnt.cc

//vowels.cc 
#include <iostream>
using std::cin; using std::cout; using std::endl;

int main()
{
    // initialize counters for each vowel
    unsigned aCnt = 0, eCnt = 0, iCnt = 0, oCnt = 0, uCnt = 0;

    char ch;
    while (cin >> ch) {
    	// if ch is a vowel, increment the appropriate counter
    	switch (ch) {
    		case 'a':
    			++aCnt;
    			break;
    		case 'e':
    			++eCnt;
    			break;
    		case 'i':
    			++iCnt;
    			break;
    		case 'o':
    			++oCnt;
    			break;
    		case 'u':
    			++uCnt;
    			break;
    	}
    }
    // print results
    cout << "Number of vowel a: \t" << aCnt << '\n'
         << "Number of vowel e: \t" << eCnt << '\n'
         << "Number of vowel i: \t" << iCnt << '\n'
         << "Number of vowel o: \t" << oCnt << '\n'
         << "Number of vowel u: \t" << uCnt << endl;

    return 0;
}

//othercnt.cc 
#include <iostream>
using std::cin; using std::cout; using std::endl;

int main()
{
    char ch;
    // initialize counters for each vowel
    unsigned vowelCnt = 0;
    unsigned otherCnt = 0;  // count anything that isn't a vowel

    while (cin >> ch) {
        // if ch is a vowel, increment the appropriate counter
        switch (ch) {
			case 'a': case 'e': case 'i': case 'o': case 'u':
				++vowelCnt;
				break;
            default:
                ++otherCnt;
                break;
        }
    }
    // print results
    cout << "Number of vowels: \t" << vowelCnt << '\n'
         << "Total non-vowels : \t" << otherCnt << '\n';

    return 0;
}